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  1. Pubblicazioni

Optical and Photochemical Characterization of Chromophoric Dissolved Organic Matter from Lakes in Terra Nova Bay, Antarctica. Evidence of Considerable Photoreactivity in an Extreme Environment

Articolo
Data di Pubblicazione:
2013
Abstract:
Water samples from shallow lakes located in Terra Nova Bay, Antarctica, were taken in the austral summer season and characterized for chemical composition, optical features, fluorescence excitation−emission matrix (EEM) and photoactivity toward the generation of •OH, 1O2, and 3CDOM* (triplet states of chromophoric dissolved organic matter). The optical properties suggested that CDOM would be largely of aquagenic origin and possibly characterized by limited photochemical processing before sampling. Moreover, the studied samples were highly photoactive and the quantum yields for the generation of 3CDOM* and partially of 1O2 and •OH were considerably higher compared to water samples from temperate environments. This finding suggests that water in the studied lakes would have considerable ability to photosensitize the degradation of dissolved compounds during the austral summer, possibly including organic pollutants, also considering that the irradiance conditions of the experiments were not far from those observed on the Antarctic coast during the austral summer.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
NATURAL-WATERS; HUMIC SUBSTANCES; ULTRAVIOLET-RADIATION; AQUEOUS-SOLUTION; MOUNTAIN LAKES; TRACE-ELEMENTS; SURFACE-WATER; TRIPLET-STATES; CLIMATE-CHANGE; SOLAR-LIGHT
Elenco autori:
Elisa De Laurentiis; Sandro Buoso; Valter Maurino; Claudio Minero; Davide Vione
Autori di Ateneo:
MAURINO Valter
MINERO Claudio
VIONE Davide Vittorio
Link alla scheda completa:
https://iris.unito.it/handle/2318/141267
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/141267/23063/ES&T2013_AntLakes.pdf
Pubblicato in:
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Journal
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